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Auxins, the hidden player in chloroplast development

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Abstract

Throughout decades of plant research, the plant hormones known as auxins have been found to be of vital importance in most plant development processes. Indole-3-acetic acid (IAA) represents the most common auxin in plants and can be synthesized from its tryptophan precursor, which is synthesized in the chloroplast. The chloroplast constitutes an organelle of great relevance to plants since the photosynthesis process by which plants get most of their energy is carried out there. The role of auxins in photosynthesis has been studied for at least 50 years, and in this time, it has been shown that auxins have an effect on several of the essential components and structure of the chloroplast. In recent decades, a high number of genes have been reported to be expressed in the chloroplast and some of their mutants have been shown to alter different auxin-mediated pathways. Genes in signaling pathways such as IAA/AUX, ARF, GH.3, SAUR and TIR, biosynthesis-related genes such as YUCCA and transport-related genes such as PIN have been identified among the most regulated genes in mutants related to alterations in the chloroplast. This review aims to provide a complete and updated summary of the relationship between auxins and several processes that involve the chloroplast, including chloroplast development, plant albinism, redox regulation and pigment synthesis.

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Abbreviations

IAA:

Indole-3-acetic acid

Trp:

Tryptophan

AUX/IAA:

AUXIN/3-INDOLE ACETIC ACID

TIR1:

TRANSPORT INHIBITOR FACTOR1

CAB:

Chlorophyll a–b binding proteins

DOC1 :

DARK OVEREXPRESSION OF CAB1

NTRC :

NADPH–THIOREDOXIN REDUCTASE

CMAL :

CHLOROPLAST MraW-LIKE

SAUR :

SMALL AUXIN-UP RNA

GH3 :

Gretchen Hagen 3 Family

YUC :

YUCCA

PIN:

PIN FORMED

PHY :

PHYTOCHROME

HB7 :

Homeodomain-leucine zipper I HB7

GLK2 :

GOLDEN 2-LIKE

ARF :

AUXIN RESPONSE FACTOR

GLK1 :

GOLDEN 1-LIKE

AHK :

Arabidopsis histidine kinase

ALA:

5-Aminolevulinic acid

ARR :

The type B Arabidopsis response regulators

CAO :

Chlide a oxygenase

CHLH :

Magnesium chelatase

LHCB :

Light-harvesting complex II chlorophyll binding protein

CLH :

Chlorophyllase

CRY :

Cryptochrome

DELLA :

Gibberellic acid-regulated growth-repression DELLA proteins

EBF1 :

EIN3-binding F-box 1

EIN3/EIL1 :

Ethylene-insensitive 3/EIN3-LIKE 1

GUN4 :

GENOMES UNCOUPLED 4

HEMA :

Glu-tRNA reductase

GA:

Gibberellin acid

ABA:

Abscisic acid

ABI5 :

ABSCISIC ACID-INSENSITIVE 5

NO:

Nitric oxide

HP2 :

HIGH PIGMENT2

SKL1 :

SHIKIMATE KINASE-LIKE1

PGAM:

Phosphoglycerate mutase amino sequence

PGDH1 :

PHOSPHOGLYCERATE DEHYDROGENASE1

RNJ :

RIBONUCLEASE J

SVR9 :

SUPPRESSOR OF VARIEGATION9

SVRPL1 :

SUPPRESSOR OF VARIEGATION9 LIKE-1

2,4-D:

2,4-Dichlorophenoxyacetic acid

HY5 :

LONG-HYPOCOTYL5

ROS:

Reactive oxygen species

H2O2 :

Hydrogen peroxide

AsA–GSH cycle:

Ascorbate–glutathione cycle

Cd:

Cadmium

References

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Acknowledgements

This research was supported by a Posdoctoral Fellowship to A.S.I from the Consejo Nacional de Ciencia y Tecnología (CONACyT). This work was supported by a grant from CONACyT to C.D-L-P (CB2016-285898 and CB2016-286368) and from the Marcos Moshinsky Foundation.

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ASI: wrote the manuscript. CDLP: conceptualization, funding acquisition, supervision, writing-review and editing.

Corresponding author

Correspondence to Clelia De-la-Peña.

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Authors declare that they have no conflict of interest.

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Communicated by Neal Stewart.

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Salazar-Iribe, A., De-la-Peña, C. Auxins, the hidden player in chloroplast development. Plant Cell Rep 39, 1595–1608 (2020). https://doi.org/10.1007/s00299-020-02596-y

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